/*
 * Copyright 2008 - 2010 Lars Heuer (heuer[at]semagia.com). All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.semagia.atomico.server.impl.jaxrs;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;

import com.semagia.atomico.dm.IWritableRepresentation;
import com.semagia.atomico.server.UnsupportedMediaTypeException;
import com.semagia.atomico.server.storage.StorageException;

/**
 * Resource representing a list of available collections.
 * 
 * @author Lars Heuer (heuer[at]semagia.com) <a href="http://www.semagia.com/">Semagia</a>
 */
@Path("/")
public final class OverviewFeedResource extends AbstractFeedBaseResource {

    private final long _lastModification;

    public OverviewFeedResource(@Context Request req, @Context UriInfo uriInfo) throws StorageException {
        super(req, uriInfo);
        _lastModification = getStorage().lastModification();
    }

    /* (non-Javadoc)
     * @see com.semagia.atomico.server.impl.jaxrs.AbstractBaseResource#lastModification()
     */
    @Override
    protected long lastModification() {
        return _lastModification;
    }

    /**
     * Returns the overview.
     *
     * @param headers Http headers.
     * @return An overview feed.
     * @throws StorageException In case of an error.
     * @throws UnsupportedMediaTypeException 
     */
    @GET
    @Produces("*/*")
    public Response getOverview(@Context HttpHeaders headers) throws StorageException, UnsupportedMediaTypeException {
        final Response.ResponseBuilder builder = makeResponseBuilder();
        final IWritableRepresentation writable = _feedFactory.createOverviewFeed(
                getBaseURI(), getStorage(), getConfiguration(), 
                _lastModification, MediaTypeUtils.toAtomicoMediaType(headers.getAcceptableMediaTypes()));
        return ResponseUtils.buildStreamingEntity(builder, writable);
    }

}
